Potassium sodium tartrate

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Potassium sodium tartrate
Names
IUPAC name
Sodium potassium L(+)-tartrate tetrahydrate
Other names
Rochelle Salt
Seignette Salt
Properties
KNaC4H4O6·4H2O
Molar mass 282.1 g/mol
Appearance large colorless monoclinic needles
Density 1.79 g/cm³
Melting point 167 75 °C (167 °F; 348 K)
26 g / 100 mL (0 ℃); 66 g / 100 mL (26 ℃)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium sodium tartrate (tetrahydrate), more commonly known as Rochelle Salt, is a double salt of tartaric acid first prepared (around 1675) by an apothecary, Pierre Seignette, of La Rochelle, France.

Properties

Chemical

Physical

Uses

  • Potassium Sodium Tartrate is used in the preparation of Biuret reagent.
  • Potassium Sodium Tartrate is used in the the preparation of Fehling's Solution
  • Potassium Sodium Tartrate is used in "crystal" microphones.
  • Potassium Sodium Tartrate is used as an alkaline buffer.
  • Potassium Sodium Tartrate has been used as a laxative.

Availability

Potassium Sodium Tartrate is readily available on EBay.

Preparation

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Projects

Handling

Can be irritating to skin.

Safety

Storage

Potassium Sodium Tartrate is very deliquescent and should be stored in a sealed container.

Disposal

Dissolve in large excess of water and put down drain.

References

Relevant Sciencemadness threads